stokely



March 5, 1935. R. L. STOKELY TELEPHONE EXCHANGE SYSTEM Original Filed Sept. 18. 19:50

2 Sheets-Sheet 1 IIHI- Qhku //v VEN 7'0Fl' F. L. STOMELY 2 Sheets-Sheet 2 INVENTOH H. L. .STOKELY BY ATTOR EY March 5, 1935. R. L. STOKELY TELEPHONE EXCHANGE SYSTEM Original Filed Sept. 18, 1930 Mm J! MM H mm lnl lh: FILUDN qxizmmwmkE v lluiqhl J: G 5 IIIIUPPIIIU) Nm k m.

Reissued Mar. 5, 1935 sins-s arses" [1 491 nous EXCHANGE SYSTEM ii; ,.il. designate this. assign or to Dell Telephone Laboratories, Incorporated,

New York, Y a corporation of New York organ-Na.

9.9.241; dated ,May 24, iota-serial .No. 4 8 2, 69 9,- September 18,;1930. :Application 7 for reissue March 2, 1

fIT'h-isinvention relatesto telephonetiexchange .systemsand more, particularlwto systems arranged to. serve messagerate subscribers.

i The: object ofthis invention .is to pro-vide'a 5 reliablearrangement forvariablycharginga calling; subscriber depending upon the destination and duration Qfa call.- I Accordingto thisdnyentionagtiming and chartsing mechanism, individual to the trunkconductors which-connect; a; line-finder. ,switohtwitha first selector switchina step-by-step; system,

is effective to. variably operate, the-message registerof a calling line in ,acco rdanoewithzthe destination and duration of a .call-- ,On-locallor other-minimum rate calls the register-is. operated once for an initial unit period of conversation and once for eachadditionalunit period .of conversation. On interofiice calls, forrwhicha-high- ,er -charge isto be made-,. the outgoing trunk-re- 20 peateriseitective immediately after itsiseizure to vary the timing and charging mechanism in order that the number s of -meter; operations .and the length ofythe unit; periods of conv,ersation will correspond to,-the,destination of the call, 25 --Afurther-feature of theinvention resides in arrangingan outgoing trunkrepeater circuit so that immediately after its seizure the sleeve conductor is connected toa booster -battery.,-so, as to transmit acurrent impulse to the timing-and charging mechanism associated withthe trunk between the lineef nder, and, firstrselectorr .qThe duration-of the connection to .the booster-battery-and the resulting impulseindicates the destination of the calland controlsthe timing and charging. mechanism so-that the number. of meter .operationsand the, length of the unit periods of conversation will correspond tothedestination of the. call. The, timing-and charging--mechanism-is arranged so that there is no possibilityof overcharging in case the sleeve terminal of -the repeater is tested by a hunting selector during thetransmission of the impulse-- e ,One. embodiment of this invention is shown diagrammatically. in the drawings, and theoperationof the system therein disclosed will be explained indet-ail. It isunderstood, however, that various, modifications-and other applications of the invention will readily occur to those skilled in the art. Referringto the drawings,-1 shows a; calling subscribers station A, a line finder LF, aselector S1, and a trunk circuit T which isindividualto andpermanently associated with the line finder LF and selector S1; o I

Fig. 2 shows a repeater R, an incomingselector S2, a. connector C and a called subscribers Sta-- tion By A -E igs. ;;3, 4-,- 5 and 6 show various schemes; for connect n h te m n l o on e he ba s: of

60 the timing switch of the trunk T. By use or a 934, Serial No. 713,763

27 Claims. (01. 1'797.1)

particular, one; of these wiring-; arrangements the system shown in Figs. 1 and 2 maybe adapted i orcfiecting the proper message charges ina p r i ul r re a '2';

. .The, line finder sw' ch vLF, which may: be of the welhknown Strowgertype; isrepresented schematically by the-brushes 11, -12,-'and 13 and the terminals .with which they are associated.-' The broken lines represent portions of the line finder circuit which have been omittedbecause they are not involved in the description of this invention. .For a detailed description of the-,operation i-of; the switch-LP referencemay, be -had to Batent 1,711,682 issued; to Hoyland, May '7, 1-92 9; themultiple brushes 11 42 and 1.3 correspond to one of the two sets of brushesshown in the-Hovland patent.

- {The selector switches S1 ector switch C may alsobe of the Strowgertype.

I'hese switches arerepresenteglschematically by the brushes 51,- 52 and 53',;the brushes 8;l,'82 and 83, and the brushes 91,92 and 93, respectively and by the associatedsets of terminals. qThe broken-dinesrepresentportions of the circuits of n.-

The trunk circuit 'I ;cornpr ises; the usual polarized supervisory relay whose windings. arein series with thetall-ring conductors of the trunk, zoneflre- .laysjorregistering the destinationof the oaIL-and a'charging switch M for measuring the-unit periods. of; conversation and operating the calling subscribers message register. The supervisory relay, is not operated by. the current flowing through its windings during the establishment of theconnection butis operated when the current throughits windings is reversed-in consequence of the answer of the called subscriber. I

- The repeater circuit R is arranged to .repea dialimpulses over-the outgoing trunk in-the usual manner. .Upon seizure, the repeater transmits a booster-battery impulse overv the sleeveconductor to the trunk circuit; associatedwith the selector bywhich the repeater-is seized. The duration of this impulse indicates the zone in which the outgoing trunk terminates.

I Upon: receipt of a booster-battery impulse by the trunk T, the corresponding zone relays are operated to register the zone in which the called station is located. When theppolarizecl supervisory relay operatesinconsequence o f the answer of the called subscriber, the charging switch M closes the circuit for operating the-calling subscribers register one, two, three,- four, or five times, as controlled by the zone relays, as-a charge for the, initial unit period of conversation which the switch M proceeds to count ofi under control of a properly timed interrupter. If the conversation continues beyond this measured unit period, the calling subscriber's register is again operated under control of the zone relays and switch M as the charge for an additional period of conversa tion. The charge for additional periods of conversation may or may not consist of the same number of meter operations as the initial charge,

and the duration of the additional unit periods may or may not be equal to the duration of the initial period of conversation.

The operation of the system shown in the drawings will now be described in detail. Assume a call to have been originated at station A, that station B is the called station, that the line finder LF has extended the line 1 of the calling station through brushes 11, 12 and 13 over the talking conductors of trunk T to the selector S1, that the selector S1 has been operated in response to the dialing of the first digit of the called station's number to select a group of trunks, and that the selector has automatically selected an idle trunk in that group. The conductors of the selected trunk 60 connect to the repeater R which is arranged to repeat the impulses created by the dialing of the remaining digits of the called station's number, over the outgoing interoflice trunk conductors 7'7, to an incoming selector in the distant oflice 'to which these conductors are connected,

.and to a connector which has access to the line of the called station. As soon as the talking conductors of trunk T are extended by selector S1 to the repeater R, the line relay 61 ofthe repeater is energized in a circuit which may be traced from battery through the lower winding of relay 61, upper outer back contact of relay 75, ring conductor of trunk 60, brush 52 of selector S1, right hand winding of the polarized supervisory relay 30, brush 12 and ring terminal of line 1, overline 1 and through the subscriber's set at station A, tip terminal of line 1 and brush 11, left hand winding of relay 30, brush 51 of selector S1, tip conductor of trunk 60, inner upper back contact of relay '75, and through the upper winding of relay 61, to ground. Relay 61 operates thereby closing a circuit through the winding of slow-to release relay 62. Relay 62 operates, thereby connecting ground through its inner upper front contact, over conductor 63, through the upper back contact of relay 67, over the sleeve conductor of trunk 60, brush 53 of selector S1, to the winding of relay 15 and through the back contact of relay 18, to the left hand winding of relay 16. Relay l5 op- I erates, but relay 16 is marginal and does not operate at this time. Relay 15 connects the ground at the back contact of relay 43, over conductor 14, to the sleeve conductor of line finder LE to hold the cut-off relay 3 until the connection is released. The cut-01f relay 3 was previously operated in the usual manner when the brushes of line finder LF found the terminals of line 1. Relay 15 also connects ground; through its innerlefthand front contact, to conductor 19. The selector S1 is held operated, by the ground on'the incoming sleeve conductor of repeater R, in the usual manner.

The aforementioned operation of relay 62 of repeater R is also effective to close an obvious circuit through the lower winding of relay 64, and to close a loop across the outgoing conductors of trunk '77 so as to operate the line-relay (not shown) of the incoming selector to which these conductors are connected in the ofiice of the called station E. This loop may be traced from the ring conductor of trunk 7'7, through the outer upper front contact of relay 62, back contact of rethe connection to battery '70.

lay 73, upper winding of relay 64, lower back con tact of relay '75, lower winding of relay65, upper front contact of relay 61, to the tip conductor of trunk '77. The current through the lower winding of relay 64 electro-magnetically opposes the current flowing through the upper winding of this relay until the answer of the called subscriber causes the current through the upper winding to be reversed. Therefore, relay 64 does not operate upon closure of the aforementioned loop; but relay 65 is operated by the energization of its lower winding. Relay 65 connects the brush of interrupter 66 through the outer lower back contact of relay 69, and lower back contact of relay 67, to the winding of relay 67. The pick-up interrupter 66 is arranged to connect its brush to ground once every two seconds, the connection being opened approximately one tenth of a second after its closure. As soon after relay 65 operates as the brush of interrupter 66 is connected to Relay 6'7 transfers its ground, relay 67' operates. winding through the front contact of its lower make-before-break springs to the brush of interrupter 68, and closes an obvious circuit for operating relay 69. Interrupter '68 is arranged to hold relay 6'7 operated for an interval which is indicative of the charging rate for the use of the interoffice trunk with which this repeater is associated. For instance, repeaters associated with trunks to an offlce in zone 2 are equipped with an interrupter which holds relay 67 operated for four tenths of a second; repeaters associated with trunks to an oflice in zone 3 areequipped with an interrupter which holds relay 67 operated for eight tenths of a second; repeaters associated with trunks to an office in zone- 4' are equipped with an interrupter which holds relay 6'7 operated for one and'two tenths seconds; and repeaters associated with trunks to an oil-ice in zone 5 are equipped with an interrupter which the charging trunk since the calling station is 1 to be charged at the minimum rate.

Relay 69 looks through the front contact of its make-before-break springs, to ground at the inner lower front contact of relay 62; so that relay 6'7 cannot operate a second time after the circuit through its winding is opened by interrupter 68. During the time that relay 6'7 remains operated, after relay 69 has operated, the sleeve conductor of trunk 60 is transferred from the ground 'on holds relay 67 operated for one and'six tenths secconductor 63, through the upper front contacts of relays 6'7 and 69, and through resistance 72 and lamp '71, to the booster-battery 70 thereby causingan increase in the current through the windings of relays 15 and 16 of trunk T. Relay 15 is thus held operated and relay 16 is operated one or more times depending upon the duration of When relay 67 releases, due to the opening of the connection to ground at interrupter 68, the sleeve conductor of trunk 60 is again connected through the upper back contact of relay 67, to ground over conductor 63. I

/ The aforementioned operations of relay 16 of trunk T, upon extension of the calling line to repeater R, are effective to operate that combination of zone relays 22, 23, 24 and 25 which corresponds to the length of booster-battery impulse received from the repeater R. When operated. relay 16 looks through its right-hand winding and ut rhhwzhn t un e 20 al-T l-hlht hhunte .11 s a n ed, ec n ht it is qh d. nc erery r.-.te ths on ee..-

hshrefi durine;i ri wo hs qt seeh dl; .lmshmnt r 1 7 n .fifih eo e hs sla hth hes et-iq:

l0 ing of relay 18, so that relay 1Q,

-1dfit16 sh 1d-. rlihi rh te d se hs s syls z eh win n Qt re ay. .6 Q 2 t e 19 i s e ve. qndh tq il-h nk; I 1 9 t hh sh sn 183 s h e sed s wh 31, relay 16 occurs since the booster-battery impulse is terminated at the same time that the holding circuitjor relay lfi isppened, But if the called oflice is in gone 4pr 5 the booster-battery impulse .is prolonged to cause a reoperation of rehrs 16; and 18.;for each additiona1.,,fo.untenthsnf a second of the duration of the booster battery impulse A second operation of relays 16 and 18 effective to operate zone relay 23, althird opera tion is effective; to operate zone relay 24, and a fourth Operation is efi'ective to operate zone relay 25. Any of relays 23, 24; and 25, which are thus operated, lock in a similar manner to that in which relay 22 is;locked, to the ground on conductor 19. ,With none of these zone recording relays operated, the; metering switch M will charge the call n subscriber :at the zone irate; with only relay 22 operated, the metering switch will charge at the zone 2 rate; with only relays 22 and 23 operated, the meteringtswitch will charge at the zone 3 rate; with; only relays 22, 23 and 24;operated the metering switchwill charge at the zone 4 rate; and with all of relays 22, 23, .2} and ,25 operated, the metering switch will charge at the zone 5 rate. The calling subscriber continues to dial all of the digits of :the called stations number, the dial impulses being repeated by the=repeater R. to control the selective operations of;,the.. selector S2 and ,the connector .0. The release of relay 61 upon s htqi .th ihh iimnh ss h sehhtra h opens the loop across the outgoing conductors of and a ses. he ..o h iqh.. s 0 tp release relayflg Relay f73'shorteircuits the lower n f-re ay 65 hd-theh n r h ineo rela t redu th 10911. resistance ac os the hhtgh ns, ohduht rs. o t hh .Wdu ihe r n mission of outgoing impulses, relayg73 being .designed to remaih operated until ally of the,. ;irn pulsesin each train havebeen repeated. 1 Relay 65 may release during impulse, transmission but hh y 6H hhh l dby h sho t i h i h "it hope? in i g. The. a te na r ea en reoperation oifrelay 61 causes the incoming. im: shew h hr e dhv r.hu QPP Ih the selector S2 and connector C. The resistance as interruptep 17.- opens the holding .circuit for' 1 con ected-ac ss,the-b sk co a sma p e t fixhn m ihn i? l e, pulse r l 1e ea sht e n h h t i Qt mpu se an th .ou r conta s, re a .3 t i that relay i-w erat w -hi ts; seeonds afterthe repeater is seized; even though the first impulses are received before relay 67 erat s, l en;. connection with the line 99 of the; called tm Be e b n p mhle ed n e dsuh: rss hh e hsw swth qonhehtor sw h: n ons the usual manner to reverse the current over d q hs 9 thunk 7'7"v t e y; u n the operation of rel ay v 64... Relay. 64 closes; al circuit Q heneii et e arflh larHZS reverses h hh ct hsh tw h 1 w n in s; o t l e e ay fi hnd e com n uctor of trunk .60 soy ha th urr n e er he alki c u th so v r nk I an it u th w ndi s-0 t e polarized supervisory relay 3Q is also reversed tooperaterelayBO With relay -75 operated'both windi 9 r a 65 as W l he upper w nd:

ing of relay 64 are including in ,the-1oop;across t e hi t-sh ne. ond c o o t nkz' the eby .imprqv sth r m ss o o ta in -cu t through condensers'ZG. during conversation.;y fTIhe operation of supervisory relay 3() initiates the operation of the metering'switch Mwby conne t n the rig a w nd n -01. rela .31 1

thro h e. in r thn eck con ac of ssh-Y mntw t -Q re h h and back-contact of.;relay 31, to the brush of interrupter. 32-. The brush of. interrupter,32 is connec ted to ground for tw o seconds out of every four so that the right-hand wind-f ing. of .relay 31 is energized-notlater than two seconds after relay, 30 operates. ;-Re1ay 31 is not. sufiicientlyenergized to open its right-hand back contact, but its left-hand contacts are-operated to connect its left-hand winding to the 4 ground on. conductor 19; 'I he left-hand wind ing otrela'y 31s is short-l-circuited by the ground at interrupter 32;,until the interrupter ope nsthis connection athwhich time both windings of relay 3 1 are ener ized in series and the ,remainder. of its contacts arethus operated. ,The complete operation of relay 31, transfers the connection from interrupter 32, to the left-hand backcontact and winding of relay 33, so that relay 33 operates assoon as thebrush of,interrupte r,32 is ,again connectedto ground. Relay 33 locks through -,its inner left-hand front contact to ground on conductor 19, independently of whether re1ay 30 remains energized; but the initial operation of relay 33 dependsupon, relay. 30 having remained energized ,from 'the. timethat relay 31 was operated until relay33 operated; this periodbeing in no case lessthantwo seconds. False initiationof the charging operation isthus prevented if supervisory relay 30 .is momentarily operated due to a trunk or line busy signal. Belay 33 connects the winding of relay 391 through the inner right-hand front contact of relay 33, frontcontact of relay 30, outer righthand frontcontacts of relays33 and 15 outer left-hand front contact of relay 33, terminal 1 and brush of bank 39, inner right-hand front contact of relay 15d, and through the brush and terminal 1 of bank 38 to the brush of inter: rupter 1'7. Relay 34 operates, as.soon as'interrupter .1'1 connects groundto its brush, to close an obvious circuit ljor operating vthe stepping magnet of themetering switch M..... When interrupter 17 opens the ground connection (.2

" half' minute until terminal 22 winter 17 to interrupter 47.

release of magnet 35 then advances thebrushes of banks 36, 37, 38 and 39 to position 2. Relay 34 reoperates, as soon as interrupter 17 again closes the connection to ground, in a circuit from battery through its winding, back contact of magnet 35, terminal 2 and brush of bank 39, right inner front contact of relay 15, through brush 38 to interrupter 17. Relay 34 closes the circuit for'operating magnet 35 and'magnet 35 opens the circuit for relay 34. The release of relay 34 opens the circuit for magnet 35 and the release of magnet '35 advances the brushes of switch M to position 3 without waiting for interrupter 17 to open the ground connection. Relay 34 immediately reoperates before the ground at interrupter 1'7 is opened so that magnet 35 reoperates and when the ground connection at interrupter 17 is opened the release of relay 34 and magnet 35 advances the brushes of switch M to position 4; the circuit for operating relay '34 in position 3 is traced from battery through its'winding, right inner front contact of relay 33, contacts of relay 30, right outer front contacts of relays 33 and 15, terminal 3 and'brush of bank 39, right inner front contact of relay 15, and through the brush and terminal 3 of bank 38, to ground at interrupter 1'7. Each subsequent closure'and opening of the ground connection at interrupter 17 causes the advance of switch M two steps, until the brushes of switch M have been advancedto terminal 11. When the brush of bank 38 leaves terminal and engages terminal 11 the operating circuit of relay 34 is transferred through brush 38 from inter- I-nterrupter 4'7 closes a ground connection for approximately half a second out of every thirty seconds; so that the brushes of switch M are now advanced at the rate of one terminal every is reached. Terminal 22 of bank 38 is connected to ground at the" right-hand back contact of relay 44, so that relay 34' andmagnet 35 'are operated immediately but relay 34 is now held operated through the front contact of magnet 35 and brush 38 to the same ground. Relay 44 operates in a circuit from battery'through its winding, terminal 22 and brush of bank 39, right inner front contact of relay 15, brush and terminal 22 of bank 38, to ground at the right-hand back contact of relay 44. The right-hand inner front contacts of relay 44 close before the righthand back contact is opened so that relay 44 looks to ground on conductor 19. Relay 44 then opens the circuit for relay 34 and the release of relay 34 releases magnet 35 to advance the brushes of switch M to normal.

If conversation has not been completed by the end of the initial unit period of conversation, supervisory relay 30 has not releasedand the foregoing cycle of advancing the metering switch M is repeated. On the initial revolution it is necessary that the switch advance from terminal 21 to 22 under control of interrupter 4'? in order that an immediate closure when the switch enters position 11 will not reduce the length of the initial conversation period. But on succeeding cycles the switch is advanced immediately from terminal 21 to terminal 22 without waiting for the ground at interrupter 47, the circuit for operating stepping relay 34 being traced through brush 37 and the inner right front contact of relay 44 to ground on conductor 19.

second after its closure) relay 34 releases. The

To prevent switch M from being advanced more than one step for each closure of interrupter 17 or 4'7, stepping relay 34 is held operated in each position through the front 'contact of magnet 35, until the interrupter opens the ground connection. This arrangement prevents undercharging or overcharging in case the supervisory relay 30 is temporarily released after the call has been answered due to the receiver hook being moved up and'down at either the calling or the called stations. v

During the advance of the switch M from position 1 to position 11 of each revolution, the message register of the calling station is operated the proper number of times as a charge for one unit period of conversation. During the advance of the switch from position 11 to position '21 the switch M measures the unit period for which the charge has been made. The number of register operations and the length of a conversation period may be varied according to the zone in which the called station is located and also according to whetherthe charge is for the initial or a subsequent period of conversation. The various terminal connection arrangements by which the metering switch M may be adapted to the required plan of message-rate charges in different telephone areas, will now be explained. The following table gives, six of the many possible plans for areas having five charging zones:

Subse 22} Initial quent g Plan Zone time operaq nous of eriod tions of tune meter p meters periods Mm. Min.

6 3 3 3 l 1' r 4 4 3 I 1 1 5 5 3 1 1 We will first assume that the trunk T is arranged for charging according to plan 1. In this case, the terminals of bank 37 of the metering switch M are connected as shown in Fig. 1, with conductors 26, 27, 28 and 29 left unconnected,

except that the left armature and back contact of relay 44 are strapped together[ As soon" as switch M enters position 2 of its initial revolution, relay 43 is operated by the ground connected to terminal 2 of bank 36. Relay 43 transfers clonductor 14 from ground to booster-battery through resistance 42 and lamp 41 so as to cause one operation of the message register 4 of'the calling Sta: tion; the cut-off relay 3 and the line finder LE are held oy'this booster-battery impulse. Relay 43 ancl'register 4 release when the switch advanced to .position 3. If the called "station is in zone 1 no further operationsof relay 43 and 'regist'er 4 occur during the initial'conversation period asmea'sured'by the revolution of switch M. But if the callis to-oneof zones2, 3,4 or 5, the-operation of one or more of zone relays 22, 23,24-and connected'ground to the corresponding one oi' moreo-f term'inals'i, 6,8, and 10 of bank 36; so that the advance of switch M causes the reoperationof relay 43 to 'cause either one, two, three or four additional operations of register 4 depending upon the zone in which the called station is located. As hereinbefore mentioned relay 44 operates at the end of the first revolution. and since the 'left armature and back contact of relay 44 are strapped together, the number of meter operations for each additional revolution of switch M is the same as the number of operations for the initial revolution. since conductors 26, 2'7, 28 and 29 are not connected, subsequent revolutions of switch 'M-are made in the same length of time (5 minutes) as thefirst revolution.

If the trunk Tis arran'geclfor charging according 'to plan 2, the left armature and back contact of relay 44 are not strapped together the wiring Being exactly as shown in Fig. -1, the conductors 26,27, 28'and 29 being leftunconnected. :In this case, the meter operations for the initial revolution "of switch M are the same as for a similar call if the trunk T were arranged according to plan '1; but the operation of relay 44 at the end of the first revolution disconnects ground from conductorj45 to prevent more than one operation of the register "4 for each additional unit period of conversation irrespectiveof the zone within which the called'station is located.

If :the trunk T is arranged for charging according to :plan 3, conductors 26, 27, 28 and 29 are connected to the terminals of bank 37 as shown in Fig. '3, the remainder of the wiring being as shown in Fig. 1. In this case the number of register-operations for both the initial and subsequent revolutions of switch M are identical with those for corresponding calls when the trunk T'is arranged to charge according to plan 2 but the length of each additional period of conversation is variably reduced according to the zone'in which'the called station is located. Thus on a call to'zon'e 2 the operation of relay 44 at the'end of the' flrstrevolut'ion connects ground over conduotor46, through the outer left front contact of relay 22, over conductor 26, to terminals 17 to 20 inclusive of bank 37. Stepping relay 34 and magnet 35 are thereby operated to advance switch M past these terminals without waiting for the ground closures at interrupter 47; theretore, an additional charge is made for every 3 minutes of conversation after the initial period of 5 minutes. On a call to zone 3, the ground on conductor '46 (after the initial revolution of switch Ml 'is'co'nnected to terminals'l'l to 20 inclusive of bank 37 as'on a call to zone 2, and also through the left outer back contact of relay '24 and left outer front contact of relay 23, over conductor '27to terminals 15 and 16 of'bank 3'7 so that switch M is'advanced without delay from terminal -15 to terminal 21; therefore, an addit'idnal charge is made for every two minutes of conversation. On a call to zone 4, the ground on conductor 46 is connected to terminals 1 5 to 20 inclusive and the additional unit periodsof conveifsatio'n are the same as on a call 'to zone-2 that the connection from conductor "46. to

outer 'front contactof relay 24 over conductor 28.

On a call to zone '5, the ground on conductor 46 is -connected to terminals 15-15020 inclusive as on a call to zone 4 andis also connected through the left outer front contact of relay 25 over conductor 29 to terminals 1,3 and 14; thereforeswitoh'.-Mis advanced without delay from terminal 13 to terminal 21 so that the unit period of conversa-" tion after the initial ,periodis reduced to 1 minute.

-If the trunk T isarranged for charging according to plan 4, conductors 26, 2 7, 28 and 29 are connected as shown in Fig. '4, the remainder of the wiring being as shown in 1. This ar rangementcauses switch -M to advance without delay on the second "and succeeding revolutions from terminal 16 to terminal 21-if the called station is located in zone 2 or 3 and to advance with-- out delay from terminal 14 to terminal 2'1-0n calls to zones-4 or 5, the'connections from-ground -on conductor 46' for operating stepping relay- 34 being controlled by zone relays 22, 23, i=24-and 25 in an obvious manner. Thus the initial unit period of conversation is-5 minutes enall calls, successive unitperiods being 2% minutes for calls to zones -2 and Band 1% minutes forr calls t zones 4 -and5.

If the trunk T is arranged for charging-according to plan 5, conductors 26, 2'7, 28 and 29 are connected as shown in Fig.5, the remainder of the'wiring being as shown in Fig. 1 except that the outer right-hand frontcon-tactof relay 24 is connected directly to ground instead of being connected to conductor 45. This arrangen'ient causes switch M to advance without delay on the second and succeeding revolutions, from terminal 16 to terminal 21 if the-calledstation is located'in zone 2 or 4 and to advance without delay from terminal 14 to terminal21 if the called station is located in zone 3 or' the connections from ground on conductor 46, for operating stepping relay-34 are controlled by relays 22, 23, 24 and 25 in an obvious manner. Thus the initial unit period of conversation is -5 minutes 'on all calls, successive unit periods being 5 minutes for calls to zone -1, 2 minutesforca-lls to zones 2 and 4, and 1 minutes forcallstozonesBand-B. Since the outer right-hand front contact of relay v24 is connected directly'to ground, each chargeafter theinitial'charge, on'calls'to zones 4 and 5 *consists of two operations of register 4.

If the trunk T is arranged for charging according to plan '6, conductors 26, 27, 28 :and 29 are connected as shownin Fig. 6, theremainder of the wiring being as shown .in Fig. '1 except that the outer left-hand armature of relay 24 "is connected directly to "ground instead of being connected to conductor 46. This arrangement causes switch M to advance wi't'houtdelayon' the initial revolution fromterminal 13 to terminal 17 on calls to zones '3, 4 andk5 thus reducing the initial unit period of 'c'onversation'toB minutes. It also causes switch M to advance without delay. on the second and succeeding revolution from terminal 1'7 to termin'al21 if the called stationis located in zone 2 and from terminal 13to terminal 21 if the :called station is located in either of'zon'es 3,4 'or '5. The connections for operating stepping relay 34 are controlled'by'relays 22, 23, 24 and '25 in an obvious manner. Thus the initial unit period of conversation lsFfive' minutes on calls to'zones 1 Fan'd 2, and Bis/3 minutes on calls f to zones .3, '4 Pand 5. .The second-and Seach succeeding unit perlod o'f iconversation is 5 mini utes on a call to zone 1, 3 minutes on a call to zone 2, and one minute on a call to-zones 3, 4 or 5.

When the connection is released by the subscriber at the calling station, the line relay 61 of repeater R releases, thereby opening the loop across the outgoing conductors of trunk 77 so as to release relays 64 and 65 of repeater R and the line relay (not shown) of the connector C. The connector C is restored" to normal in the usual manner. When the connector C removes ground from the incoming sleeve conductor, selector S2 is released and returned to normal in the usual manner. The release of relay 61 also causes the release of relay 62, whereby the holding ground is disconnected from conductor 63 so as to cause the release of relay 69 and the release of relay 1.5 of trunk circuit T. The release of relay 64 causes the release ofrelay so that the repeater R is'now ready for another call. The release of relay 15 disconnects ground from conductor 19 'so as to cause-the release of relays'31, 33,44 and any of the zone relays 22, 23, 24 and 25 which were operated. The release of relay 15 also disconnects the ground on conductor 14 from the sleeve brush 13 of'line finder LF so as to cause therelease of the cut-off relay 3 and the return of the line finder to normal. Relay 15 also causes the return ofswitch M to its normal position by closing a circuit for operating stepping relay 34. With switch M in any of positions 2, 4, 6, 8 or 10 the circuit for operating relay 34 may be traced from battery through its winding, back contact of magnet 35, conductor '48, terminal andbrush of bank 39, to ground at the inner right-hand back contact of relay 15. With the switch in any of positions 3, 5, 7, 9 or 11 to 21'inclusive, the operatingcircuit for stepping relay. 34 may be traced from its winding, through the back contactof magnet 35, outer right-hand back contact of-relay 15, terminal and brush of bank 39, to ground at the inner right-hand back contact of relay 15. In each position. the operation of relay 34 causes the operation of magnet 35. The operation of magnet 35 opens the operatingcircuit 'for relay 34 so that relay 34 'and ma'gnet 35 are thus al-' ternately operated and released'to advance the brushes of switch M until they reach position 22. In position 22, relay 44 reoperates and the circuit for operating relay 34 is traced from conductor 48, through the brush. and terminal of bank 37, right inner, frontcontact of relay 44, terminal 22 and brush of bank 39, to ground at the inner right-hand back contact of relay 15. The switch M is thus returned to its normal posi-' tion, and relay 44 again releases as soon as the brush of bank 39 leaves terminal 22. The en-' tire trunk circuit T is now normal, ready'for service on'another call.

What is claimed is:

1. In a telephone system, subscribers lines, an automatic switch, means including a trunk for extending a calling line to said switch, a message register for said calling line, control means for variably operating'said register in accordance with the destination and duration'of a call, means includinganother trunk for further extending thexconnection from said calling line to a called line, and means associated with and efiective upon seizure of said other trunk for varying saidcontrol means in accordance with thedestination of the call. x .2. In a telephone system, subscribers lines, an automatic switch, means for extending a calling line to said switch, a message-register for said calling line,'-control means for variably operating said register in accordance with the destitration of the call, means including a trunk for completing the connection to a called line, and means associated with said trunk for transmit-' ting a current impulse to said control means, the duration of said impulse being indicative of the destination of the call. I

, 3. In .a telephone system, subscribers lines, an automatic switch, means including a trunk for extending a-calling line to said switch, a message register for said calling line, control means individual to. said trunk for variably operating said register, means including another trunk for further extending the connection from said calling line to a called line, and means associated with and effective upon seizure offsaid other trunk for varying said control means in accordance with the destination of the call.

v4. In a telephone system, subscribers lines, an automatic switch, means including a trunk for extending a calling line to said switch, a message register'for said calling line, control means for variably operating said register, means including an outgoing trunk repeater for completing a connection to a called line, and means associated.

with said repeater for transmitting a current impulse to said control means the duration of said impulse'corresponding to the destination of the call.

5. In a telephone system, subscribers lines, an automatic switch, means including a trunk for extending a calling line to said switch, a message register for said calling line, control means individual to said trunk for variably operating said tion and duration of a call, an interoffice trunk for further extending the connection'from said calling line to another of said lines in a difierent zone, and means associated with said-interoflice trunk and eiiective immediately upon seizure of said interoflice trunk for varying said control means in accordance with the zone in which said called line is located. i

7. In a telephone system, subscribers lines divided into a plurality of zones, an automatic switch, means including a trunk for connecting a calling line to said switch, a meter for said calling line, controlmeans individual to said,

trunk for variably operating said meter, an interofiice trunk for further. extendingthe connection from said calling line to another of said lines in a different zone, and means associated with saidinterofiice trunk and effective immediately upon seizure of said interoflice trunk for varying said control means in accordance with the zone in which said called line is'located. 1

8. In a telephone system,,subscribers lines divided into aplurality of zones an automatic switch, means including a trunk for connecting a calling line to said switch, a meter for said calling line, control means for variably operating said meter, means including a repeater for further extending the connectionfrom said calling ing'a trunk"andan'outgoinginteroffice repeater line toj another of lines in a different zone,

transmitting a current impulse to said control means the duration oi'saidimpulse'being indica tive' otthe" 'zone'"in whleh' said called line-is located. 5 11; u; a my I: in) it m t a-"In a telephone system, subscribers lines divided into a 'pluralitypf z'ofn'esj', aa'auwrriatic; switch, means includinga trunk tor connecting acalling line to said switchfa meter ior'said caljling" line, control "meansf'individual t said trunk for variably operating said nieter, *means' including a repeater for further extendingthe connection -f rordsaid calling'line to anotheroi said lines in adifierent"zone, and meansasso' ciated' with said repeater f ortrans'mitting 'a'current impulse-to. said control nieans"the duration or said impulse being I indicative "or the tone in whichsaid calledl ine' is'located;

l0, In'a telephone 's'ystem,subscribersfilines divided into a pluralityof'ionesfmea'nsincluding a" trunk and anoutgoing interofllce repeater for extending a connection from a callin line'in one of said zonestoacalled line'in adiflerentzdhefzi meter' Io'r said calling "line," control means asso:

ciated w'ith 'said' trunk including a timingswitch for measuringan' initiaiunit' period olfconvers'ation and'for measuring additional unit periods'of conversation; zone" relays individual" to saidtriink for varyingthe'nurnberof meter operations per cycle of said timing switch according to'tlie zone within whichthec'alled station is located andincluding means'fon operating said meter, and means jassoeiated with said repeater for transmit tihg a-n impul'se'w'hose durat on-is indicative of the zone within'which th'ejc'alle'd station is located tofoperatethe corresponding one or more of said zone relays. f I

' 11. In a telephone system, subscribers lines divided mm a plurality of 'z'o'nes, "means include for extending a connection from a calling line in one of 's'aid Zone'stoa called line in a different mm; a meterfor said 'calliiig'lin, controlnieans associated with said trunk including a timing switch for measuring an initial unit period of conversation and f or" measuring additional unit periods of conversation, on'e'relays" individual to said trunk for varying the lengthoi a unit period of conversation according" to" the zone within which thecalled station is located and including means for operating said meter, and means associated with said repeater for transmitting an impulse whose duration is indicative oi thezone withinwhic'h th'ec'alled' station is located" to operate the corresponding one or moreoi said zone relays-H.

""12. In a telephone system, subscribers lines divided into a plurality ofaones, means including a trunk and an' outgoing interofilce repeater for extending a'connection'from' acalling'line in one of said zones to a callediine in a different zone, a meter for said calling line,.control means associated with said trunk including a timing switch for measuring. an initial unit period of, c'o'nvers'a tion and for measuring additional unit periods of conversation,zone relays individual to said trunk for varying the number of meter operations per cycle of said timing switch and for varying the length of a unit period of conversation according to the zone within which the called station is located and including means for operating said meter, and means associated with said repeater for transmitting an impulse whose duration is indicative of the zone within which the called station is located to" operate the corresponding one 14 In a telephone system,subscribers lines, an'automatioswitch, means-including a trunk for extending a calling line to said switchi ame'ssage register-for said'ca'lling' li'ne, control means individual to-said trunk for variably o erating said register, means including another trunkrer further extending the'con'nectionir'om said-call ing line to a called line, and means associated with and immediately efie'ctive upon seizure of said other trunk for varying said control'means'in se cordance with the destination o'f-the'call; Iria telephone system, subscribers lines, an automatic switch, means including a' trunk for extending'a calling line to said switch, ame's sage'register for sai'd'calling line, control means individual to said trunk for variably operating said register, a second trunk for further extend ing the connection from said calling line," and means individual to said second 'trunkand'iinme diately effective-upon seizure of said second trunk for setting said controlmeans in accordance with destination of the call.

an automatic switch, means including a trunk' for extending a calling line to said'switch; a'mes sageregister for said calling line; cbntrol means individual to said trunk for variably" operating said register in'accordance withthe destination and duration of a call, means includinganother tr'unkior further extending thecon'nectio'r'i from said calling line to a called line, and means indi vidual' to said other trunk for transmitting a current impulse to said control means, thed'u'ra tion of saidimpulse being indicativeof the destination of the call. 4 T

17. In a telephone system, subscribers lines, an automatic switch, means for extending a callingline'to said switch, a message register for said calling line, control means for variably operating said register in accordance withthe destination and duration of thecall, means including an outgoing trunk for completing the connection to a called line, and means individual to said trunk for transmitting a current impulse to said 18. .In a telephone system, subscribers"lines,'

an automatic switch, means including a trunk for extending a calling line to said switch,a mes-' sage register for said calling line, control means for variably operating said registerin accordance with the destination and duration of a call, means inoluding'an outgoingrepeater for completing the connection to a called line,and means associated with said repeater for transmitting a current impulse to said control means the duration of said impulse corresponding to the destination of the call.

19. In a telephone system, subscribers lines, an automatic switch, means including a trunk for extending a calling line to said switch, a meslines,

message register for 'said calling line, control means individual to said trunk for variably operating said register in accordance with the destination and duration of a call, a second trunk for further extending the connection from said calling line, and means associated with said second trunk and immediately eifective upon seizure of said second trunk for setting said control means in accordance with the destination of the call.

. 21. In a telephone system, subscribers lines divided into a plurality of zones, an automatic switch, means including a trunk for connecting a calling line to said switch a meter for said calling line, control means individual to said trunk for variably operating said meter in accordance with the destination and duration of a call, an interoflice trunk for further extending the connection from said calling. line to another of said lines in a different zone, and means associated with said interofi'ice trunk and effective immediately upon seizure of said interofiice trunk for varying said control means in accordance with the zone in which said called line is located.

22. In a telephone system, subscribers lines divided into a plurality of zones, an automatic switch, means including a trunk for connecting acalling line to said switch, a meter for said calling line, control means for variably operating said meter in accordance with the destination and duration of a calhmeans including an outgoing trunk repeater for further extending the connection from said calling line to another of said lines in a different zone, andmeans associated with said repeaterfor transmitting a current impulse to said control means, the duration of said impulse being indicative of the zone in which said called line is located.

1 lines, a switch, a switchbank and wipers for said switch, means for variably marking theswitchbank of said switch in accordance with certain of the digits employed in setting up a connection,

means for continuously operating thewipers of said switch during the talking period of en established connection to wipe over said switchbank, and means controlled by the operation of the wiper of said switch for transmitting a differ- H ent number of metering impulses in accordance up and complete talkingconnections between subscribers lines located in diiferent zones, an impulse sender associatedwith one of said automatic switches, said oneautomatic switch set in a position corresponding to the zone a called subscribers line is located in, means for continuously operating said sender during the talking period of an established connection, and means con trolledby theoperation of said sender for transmitting-a number of meteringimpulses in accordance with the setting of said associated switch;

25. In a'measuredhservice telephone system wherein automatic switchesare operated in accordance with digits dialed by a calling subscriber to set up and complete talking connections between subscribers lines, a'switchperm'anently connected to oneloi said automatic switches included inthe talking connection, a switchbank and wipers for said switch, means for. variably marking the switchbank of said switch in accordance with the digit used to set said one automatic switch, means for continuously oper-.

tary switch including a wiper and bank contacts therefor, in said sender, means for continuously operating said wiper over its bank contacts during the'talking period of an established connec tion, a setof relays for variably 'marking the contactsin said 'switchbank I to determine the number of metering impulses to be transmitted over said metering circuit, andarelay operated over said wiper and the marked contacts respon s'iveto the operation of said wiper for transmitting metering impulses over said metering circuit'in accordance with the variable "marking of said bank contacts by said set of relays.

2'7. In a measured service telephone system wherein a series of automatic switches are op-' erated to set up and complete a talking connection betweena calling and a called line, a wiper on one of said automatic switches operated during the setting up ofsaid' connection to a position corresponding to the zone the called line is located in, an impulse sender associated with said one automatic switch, means for continuously operating said sender during the talking period of the established connection, a metering circuit, and means controlled by the operation of said senderfor transmitting a predetermined number of metering impulses over said metering circuit dependent upon the position said wiper is operated to in setting up said connection.

' RAY L. 'STOKELY. 

